1. (a-b) &# 178; (a-b) &# 178; (a-b) &# 178; (B-A) &# 178; (B-A) &# 178; (a + b) 178; (a-b) &# 178; (B-A) &# 178; (B-B) &# 178; (B-A) &# 178; (a + B) 178

1. (a-b) &# 178; (a-b) &# 178; (a-b) &# 178; (B-A) &# 178; (B-A) &# 178; (a + b) 178; (a-b) &# 178; (B-A) &# 178; (B-B) &# 178; (B-A) &# 178; (a + B) 178

1. B / 5A (- 2 / a)
=(b/5a)×(-a/2)
=-b/10;
2. (a-b) & 178; divided into a and 178; - B and 178
=(a+b)(a-b)/(a-b)²
=(a+b)/(a-b);
AB (B-A) & # 178; △ a + B
=(b-a)²/(ab)×a/(a+b)
=(b-a)²/b(a+b);
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5a²+6ab+b²
The third power of X - XY + XZ YZ
m²-5m
If M = 2n + 1, then the value of M & # 178; - 4Mn + 4N & # 178; is the same

5a²+6ab+b²=（a+b)(5a+b)

Factorization a ^ 2-2ab + B ^ 2-5A + 5b-6
The more detailed the process, the better, online and so on, very detailed add!

a^2-2ab+b^2-5a+5b-6
=(a^2-2ab+b^2)-5(a-b)-6
=(a-b)^2-5(a-b)-6
=[(a-b)-6][(a-b)+1]
=(a-b-6)(a-b+1).

A simple method is used to calculate 94.9 & # 178; + 9.98 + 0.1 & # 178;

49.9²+9.98+0.1²
=49.9²+2×49.9×0.1+0.1²
=(49.9+0.1)²=50²
=2500 = the third power of 2.5 × 10

Simple calculation 198 and 178;

198²
=(200-2)²
=400000-800+4
=39204

Given a / A-B = 2, find a ^ 3-4A ^ 2B / b ^ 3-6ab ^ 2

Given a + B = - 2, A-B = 2, put (a ^ 2 + B ^ 2-1) ^ 2-4a ^ 2B ^ 2

（a^2+b^2-1）^2-4a^2b^2
=(a²+b²-1+2ab)(a²+b²-1-2ab)
=[(a+b)²-1][(a-b)²-1]
=[(-2)²-1][2²-1]
=3×3
=9

Given A-B = 3, a-c = 4, find 4A - (B-C) * (B-C) - 2b-2c

Simplify the original formula
4a-(b-c)*(b-c)-2b-2c
=2(2a-b-c)-(b-c)*(b-c)
From A-B = 3, a-c = 4
The sum of the two formulas 2a-b-c = 7
Subtracting B-C = 1
So the original formula = 2 * 7-1 * 1 = 13

4a*a-b*b+2b-1

Original form
=4a²-b²+2b-1
=4a²-（b²-2b+1）
=（2a）²-（b-1）²
=（2a+b-1）（2a-b+1）

1.a-b+c=3 ① a+b+c=3 ② 4a+2b+c=6 ③
2.a-b+c=-1 ① c=-2 ② a+b+c=1③ 3.a-b+c=0 ① 9a+3b+c=0 ② a+b+c=-5 ③ 4.a+b+c=2 ① 9a+3b+c=0 ② 4a-2b=c=20 ③

1. ① - ② get - 2b = 0, B = 0, ① × 4 -, ③ get 3C = 6, C = 2, BC into ① get a = 1